ext.js文件中有这样一段js代码
[code]
(function(){
var ua = navigator.userAgent.toLowerCase();
var isStrict = document.compatMode == "CSS1Compat",
isOpera = ua.indexOf("opera") > -1,
isSafari = (/webkit|khtml/).test(ua),
isIE = ua.indexOf("msie") > -1,
isIE7 = ua.indexOf("msie 7") > -1,
isGecko = !isSafari && ua.indexOf("gecko") > -1,
isBorderBox = isIE && !isStrict,
isWindows = (ua.indexOf("windows") != -1 || ua.indexOf("win32") != -1),
isMac = (ua.indexOf("macintosh") != -1 || ua.indexOf("mac os x") != -1),
isLinux = (ua.indexOf("linux") != -1),
isSecure = window.location.href.toLowerCase().indexOf("https") === 0;
})();
[/code]
这段代码应该是加载后自动执行，不知道这没写的用以何在？是不是为了防止命名冲突？
